I bat for Team Thong! My mother and teenaged daughter both gang up on me about the butt floss, but I have to have them!
If they're not for you, they're not for you. But they're definitely for me! I'm with Lisa, in that my behind is quite round and the boy shorts just don't stay put. With that much fabric migrating to where it should not be there is WAY more of a wedgie problem than with thongs. My heavens! And given the round butt issue, my VPLs are very in-your-face if I don't have the right underwear on.
I agree with the posts here that some styles are uncomfortable, but most are fine for me. I'm sure it was rough at first, but now it's been so long that I don't remember ever not wearing them (except as a child, I guess). I love the indulgent brands, silk and lace as much as any gal, but for everyday I buy cute cotton ones super cheap at Target.